Update what4/CHANGES.md

Co-authored-by: Ryan Scott <[email protected]>

what4/CHANGES.md

@@ -7,7 +7,7 @@
 * Previously, the `exprCounter`, `sbUserState`, `sbUnaryThreshold`, and
   `sbCacheStartSize` fields of `ExprBuilder` were directly exposed; in
   principle this allows users to modify them, which was not intended
-  in some cases.  These have been uniformy renamed to remove the `sb`
+  in some cases.  These have been uniformly renamed to remove the `sb`
   prefix, and exposed as `Getter` or `Lens` values instead, as
   appropriate.